shortlog: default to HEAD when the standard input is a tty

diff --git a/Documentation/git-pack-objects.txt b/Documentation/git-pack-objects.txt
index d18259d93fe1daf1785f373b475add8ff9d2f213..5237ab0c046cb3b8468166684b04c9ef8d50e588 100644 (file)
--- a/Documentation/git-pack-objects.txt
+++ b/Documentation/git-pack-objects.txt
@@ -169,6 +169,14 @@ base-name::
        length, this option typically shrinks the resulting
        packfile by 3-5 per-cent.
 
+--threads=<n>::
+       Specifies the number of threads to spawn when searching for best
+       delta matches.  This requires that pack-objects be compiled with
+       pthreads otherwise this option is ignored with a warning.
+       This is meant to reduce packing time on multiprocessor machines.
+       The required amount of memory for the delta search window is
+       however multiplied by the number of threads.
+
 --index-version=<version>[,<offset>]::
        This is intended to be used by the test suite only. It allows
        to force the version for the generated pack index, and to force